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LM2703MFX-ADJ 데이터시트(PDF) 2 Page - Texas Instruments

부품명 LM2703MFX-ADJ
상세설명  LM2703 Micropower Step-Up DC/DC Converter with 350mA Peak Current Limit
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R1 = R2
VOUT
1.237V
-1
SW
FB
GND
VIN
SHDN
LM2703
SNVS172F – FEBRUARY 2002 – REVISED MAY 2013
www.ti.com
Connection Diagram
Top View
The maximum allowable power dissipation is a function of the maximum junction temperature, TJ(MAX), the junction-
to-ambient thermal resistance,
θJA, and the ambient temperature, TA. See the Electrical Characteristics table for the
thermal resistance. The maximum allowable power dissipation at any ambient temperature is calculated using: PD
(MAX) = (TJ(MAX) − TA)/θJA. Exceeding the maximum allowable power dissipation will cause excessive die
temperature.
Figure 2. SOT23-5
TJmax = 125°C, θJA = 220°C/W
PIN DESCRIPTIONS
Pin
Name
Function
1
SW
Power Switch input.
2
GND
Ground.
3
FB
Output voltage feedback input.
4
SHDN
Shutdown control input, active low.
5
VIN
Analog and Power input.
SW (Pin 1): Switch Pin.
This is the drain of the internal NMOS power switch. Minimize the metal trace area
connected to this pin to minimize EMI.
GND (Pin 2): Ground Pin.
Tie directly to ground plane.
FB (Pin 3): Feedback Pin.
Set the output voltage by selecting values for R1 and R2 using:
(1)
Connect the ground of the feedback network to an AGND plane which should be tied directly
to the GND pin.
SHDN (Pin 4): Shutdown Pin.
The shutdown pin is an active low control. Tie this pin above 1.1V to enable the device. Tie
this pin below 0.3V to turn off the device.
VIN (Pin 5): Input Supply Pin.
Bypass this pin with a capacitor as close to the device as possible.
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
2
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Copyright © 2002–2013, Texas Instruments Incorporated
Product Folder Links: LM2703


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